Fluid-blast stoker.



J. M. & P. W. SHULTS.

FLUID BLAST STOKER. APPLICATION FILED AUG.22, 1912.

1,109,367. Petented Sept. 1, 1914.

t W t e i i H x WEE M g 7 e V 7 NITEDISTATES PATENT. OFFICE.

JOSEPH M. s'HUL'rs Ann Fn'EDEnIo fw. snuiirsflor Business, MARYLAND.

FLUID-BLAST sToKEn.

To all whom it may concern." 1

Be it known that we, JOSEPH M. SHU'LTS and FnnoEnronrW. Srrumacitizens of the United States,residingat Baltimore, in'the State of Maryland, have invented certain new 1 anduseful Improvements in Fluid- Blast Stokers, of which'the following is a specificationjl I Thisfinventionrelates to a fluidblast termined intervals, which blasts act directly against a small quantity of coal, or similar a fuel, and thereby drive the-said fuel into thecfurnace anddistribute it over the fire bedr... l

One form of construction, for embodying i the inventionuis illustrated in the accompanying drawing in. which,

2: is a vertical section, on the fluid-blast stoker. a

The drawingsrshow an apparatus opei ated by steam. r

Referring to the drawing the '-.letter,,

grate-bars, 0, furnace door, cl,ash-pit, e, and ash-pit door, 7, are indicated tomore clearly explain the application of the fluid-blast stoker .and its relation to the furnace. suitable stationary fuel chute, 1, receives a charge of coal, coke,--,or other fuel from an elevated supply (not shown) and this chute inclines downwardly and its lower end enters the furnace at the front, It is immaterial 110w the connection of the lower end of the chute is made with the furnace front; in the present instance the chute is shown as being passed through the furnace. door plate, d. The lower end of the chute may have a vertical curve,.3, that forms a depression in which small lumps of fuel may lodge and where said lumps may choke, or partly fill, the passageway of the chute. In

- the operation of this device, the fuel in the form of lumps will, by the action of gravity or otherwise, flow down the chute,

Specificationof Letters Patent.

a larger scale, of i A i a designates a furnace, which may be'of any; known construction. ..The. brickwork, 6,

t c I Patentedse an oizt; a, ,Applic'ationfiledAugust22,1912.. Seria1No.716,474. i

pressure presentlyto bedescribed, the

curved depression will be full of fuel.- I

The improved means of the present in-,

ventionfc'omprises a cylinder, 4, having an internal bore, 5, and one endbeing closed by aport, 9, within thecylinderis a valve, 10, which closes: andz'opens said port, and-this valve hasfa stem, 11, whose end fits in and has play in a guide bearing,12. A piston, 13,'is movable 'w-ithin'the bore of .thecylinder and this piston has a central hole, 14,

which allows certain free movement of the ya head, 6,.whilethe other end has a head, 7, to which theblast-pipe, .8, is attached; I the hole or opening inthis head constitutes piston.ontheHvalve-stem, 11. .The valve stem carries a collar, 15, thatis secured rigidly to the stem by a screw, 16. This collar may be adjusted alongthe stem to such'po-' sition as will cause the proper co-action of the piston, 13, and valve, 10. Two cushion 5 springs, 17, and, 18, in the form of spirals,

, Figure 1 is anend' elevation showing in {section apart of a furnace, .and in side view the improvedfiuid-blast' stoker. Fig.

the valve,'-10, and the piston, and the other In theoperation of this device the piston has a reciprocating movement to close and openthe valve, 10; the piston is'moved in the direction to close the valve by a power spring, 19, which is under compression between the piston and the cylinder head, 6. The piston will be moved in the direction to open thevalve by the action of fluid-pressure entering the cylinder through a pipe, 20; this fluid pressure will fill the space, 21,

- spring, 18, serves as a cushionubetwieen the collar vvandthe piston. The blast-pipe, 8, E leads from thehole in the cylinder-head,- 7, where the valve-port is located,t and said pipe enters the'fuel chute, 1', at the outer side I of the curved depression, 3, as seenzin Fig. 1.

thecylinder and create a preponderance of pressure on that side of the piston that will overcome the pressure on the opposite side caused by the spring, '19, and move the piston andmomentarily open the port, 9,

thereupon fluid in the space, 21, will escape through the port in the form of a puff and will pass through the pipe, 8, and cause a quick short blast of fluid to enter the chute,

1, and such blast, acting directly against the lumps of fuel seated in the curved depression,13,of the chute, willdrive the fuel into the furnace and distribute the lumps or scatter it over the bed ofheated coals, AS

soon as this small quantity of fuel has'been for another blast. The instant the valve, 10,

is unseated by the preponderant pressure of fluid, the fluid in the chamber, 21, escapes cape, of course instantly reduces the pressure on that side of the piston: causing the preponderance of pressure to shift to the oppo-' site side of the piston where thev power spring, 19, is acting and this spring then moves the piston back the cushion spring, 17, and valve, 10, and

seats the latter. This operation of moving the piston, 13, one way by fluid, and sir'nultaneously opening the valve-port, 9', and giving a fluid blast into the fuel chute, 1 and then moving the piston in the reverse direction by the pressure of the spring and closing the valve-port, is repeated automatically.

It will be seen that we have herein disclosed means, which when set for action will 4 automatically produce short, quick blasts of compressed fluid each blast succeeded by an interval and eachfblast acting on a small charge of fuel contained in the chute and drive such fuel into the furnace.

It is to be understood the fluid-blast stoker may produce blasts of steam, or blasts of air,

Copies 'of'thi's p'atent may be obtained "for five cents each, by addressing the *Gommi ssione'r of lPatents,

until it contacts with short, quick blasts of compressed fluid, the 7 combination of a chute for conveying fuel into a furnace; a cylinder having an outlet port; a blast pipe communicating from the outlet port to the said chute; a valve controlling said outlet port and provided with 'a stem which has central pos'itlon with- 5 in the cylinder a piston reciprocable in the through the open valve-port, 9, and such cylinder and having a central hole which allows certain free movement of the piston on thevalve-stem and said piston moving the valve to open and close said port; a power spring pressing on one side of the piston and serving to move the piston in the direction that will close the said valve; and a pipe opening into said cylinder for supplying fluid-pressure that will act on the piston and move the latter in the direction that wi-llopen' the said valve.-

A stoker for feeding fuel to'furnaces by blasts of'fiuid under pressure, comprising the combination of a fuel chute in which the charge of fuel is to be seated; a fluidpressure cylinder having. an outlet port; a valve controlling said outlet port and having a stem provided with a collar that is adjustable longitudinally along saidstem; a piston movable in the cylinder and having a central hole through which loosely passes that part of said valve-stem that is between the valve and the said collar; means to supply fluid pressu're to the cylinder to operate the piston, and a blast-pipe communicating from the said outlet p'ort to the fuel chute.

In testimony whereof we affix our signatures in presence of two witnesses.

JOSEPH. M. SHULTS. V FREDERICK W. SHULTS. Witnesses: I I

' G,Fnnn. tVoe'r,

CHAS. B. MANN.

Washington-,1). C. 

